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|
# frozen_string_literal: true
module HTTPX
class Headers
class << self
def new(headers = nil)
return headers if headers.is_a?(self)
super
end
end
def initialize(headers = nil)
if headers.nil? || headers.empty?
@headers = headers.to_h
return
end
@headers = {}
headers.each do |field, value|
field = downcased(field)
value = array_value(value)
current = @headers[field]
if current.nil?
@headers[field] = value
else
current.concat(value)
end
end
end
# cloned initialization
def initialize_clone(orig, **kwargs)
super
@headers = orig.instance_variable_get(:@headers).clone(**kwargs)
end
# dupped initialization
def initialize_dup(orig)
super
@headers = orig.instance_variable_get(:@headers).transform_values(&:dup)
end
# freezes the headers hash
def freeze
@headers.each_value(&:freeze).freeze
super
end
# merges headers with another header-quack.
# the merge rule is, if the header already exists,
# ignore what the +other+ headers has. Otherwise, set
#
def merge(other)
headers = dup
other.each do |field, value|
headers[downcased(field)] = value
end
headers
end
# returns the comma-separated values of the header field
# identified by +field+, or nil otherwise.
#
def [](field)
a = @headers[downcased(field)] || return
a.join(", ")
end
# sets +value+ (if not nil) as single value for the +field+ header.
#
def []=(field, value)
return unless value
@headers[downcased(field)] = array_value(value)
end
# deletes all values associated with +field+ header.
#
def delete(field)
canonical = downcased(field)
@headers.delete(canonical) if @headers.key?(canonical)
end
# adds additional +value+ to the existing, for header +field+.
#
def add(field, value)
(@headers[downcased(field)] ||= []) << String(value)
end
# helper to be used when adding an header field as a value to another field
#
# h2_headers.add_header("vary", "accept-encoding")
# h2_headers["vary"] #=> "accept-encoding"
# h1_headers.add_header("vary", "accept-encoding")
# h1_headers["vary"] #=> "Accept-Encoding"
#
alias_method :add_header, :add
# returns the enumerable headers store in pairs of header field + the values in
# the comma-separated string format
#
def each(extra_headers = nil)
return enum_for(__method__, extra_headers) { @headers.size } unless block_given?
@headers.each do |field, value|
yield(field, value.join(", ")) unless value.empty?
end
extra_headers.each do |field, value|
yield(field, value) unless value.empty?
end if extra_headers
end
def ==(other)
other == to_hash
end
def empty?
@headers.empty?
end
# the headers store in Hash format
def to_hash
Hash[to_a]
end
alias_method :to_h, :to_hash
# the headers store in array of pairs format
def to_a
Array(each)
end
# headers as string
def to_s
@headers.to_s
end
# :nocov:
def inspect
"#<#{self.class}:#{object_id} " \
"#{to_hash.inspect}>"
end
# :nocov:
# this is internal API and doesn't abide to other public API
# guarantees, like downcasing strings.
# Please do not use this outside of core!
#
def key?(downcased_key)
@headers.key?(downcased_key)
end
# returns the values for the +field+ header in array format.
# This method is more internal, and for this reason doesn't try
# to "correct" the user input, i.e. it doesn't downcase the key.
#
def get(field)
@headers[field] || EMPTY
end
private
def array_value(value)
Array(value)
end
def downcased(field)
String(field).downcase
end
end
end
|
